What Is Ball Mill Trunnion Bearing?

A ball mill trunnion bearing is a large cylindrical bearing used to support the ends of a rotating mill shell.
The trunnion bearings are commonly used in cement, metallurgical, mining, and other related industries.
In a ball mill, the cylindrical shell is rotated on a horizontal axis and is supported at both ends by trunnion bearings.

Ball Mill Trunnion Functions


  1. Trunnion: A trunnion is a cylindrical protrusion used as a mounting and pivoting point.
    In a ball mill, there are two trunnions, one at each end of the mill.
    The trunnions provide support to the rotating mill shell.
  2. Trunnion Bearings: The trunnion bearings are large, specialized bearings that are typically made of bronze or white metal.
    They are mounted on the trunnions and support the entire weight of the mill, as well as the grinding media and material being ground inside the mill.
    These bearings allow the mill to rotate smoothly.
  3. Lubrication: Proper lubrication is essential to prevent overheating and premature wear of the trunnion bearings.
    Lubrication systems are used to deliver oil or grease to the bearings, ensuring they operate smoothly and with minimal friction.
  4. Seals: Trunnion bearings are often equipped with seals to prevent dust and contaminants from entering the bearing housing.
    This helps maintain the integrity of the bearing and prolong its lifespan.
  5. Temperature Monitoring: Many modern ball mills are equipped with temperature monitoring systems to ensure that the trunnion bearings operate within a safe temperature range.
    Overheating can lead to bearing failure and costly downtime.

The trunnion bearings play a critical role in the operation of a ball mill, as they support the entire weight of the rotating shell and help maintain the mill’s stability and efficiency.
Proper maintenance and lubrication of these bearings are essential to ensure the long-term performance of the mill.
If the trunnion bearings fail, it can lead to unplanned downtime and costly repairs.

The process of producing mill trunnion bearings typically involves several key steps.
First, in the material preparation stage, suitable raw materials (usually copper alloys or white metals) are selected and initial processing of shape and size is performed.
Next, machining equipment is used to precisely machine the material to create the main body of the trunnion bearing, as well as machine lubrication holes and seals.
The trunnion bearings are then installed onto both ends of the ball mill, ensuring proper installation and tightening.
A lubrication system is also installed to ensure proper lubrication.
Finally, quality control inspections and testing are performed to verify that the product meets specifications and standards.
Once completed, the manufactured trunnion bearing is appropriately packaged and shipped to the customer or assembly plant.

It is important to emphasize that each production process may vary depending on the manufacturer, product specifications, and requirements.
Quality control and testing are critical steps to ensure product performance and reliability, so they are taken very seriously.
Producing trunnion bearings requires extensive engineering and manufacturing experience.

ball mill spare parts

Ball Mill Trunnion Advantage


  • Our company employs a special heat treatment technique to enhance the hardness of trunnion bearings, thereby increasing their resistance to impact forces.
  • The trunnion bearings produced by AGICO are made from high-strength steel.
    Before casting, our dedicated engineers optimize the technical structure of the trunnions based on the operational characteristics of the ball mill.
    This ensures both the long-term stability of the components and extends their lifespan.
  • AGICO possesses robust capabilities in steel casting production, enabling us to supply castings in large quantities with short lead times.

AGICO offers customizable solutions for mill trunnion bearings, allowing us to customize our products to meet the exact specifications provided by our customers.
Our commitment to precision manufacturing and engineering excellence allows us to turn your vision into reality.
Whether you have specific design requirements, dimensional changes, or unique technical specifications, AGICO’s expertise and flexibility ensure your custom trunnion bearings are a perfect match for your project needs.
We are committed to providing customized solutions that meet and exceed our customers’ expectations, reflecting our unwavering commitment to quality and customer satisfaction.

AGICO is proud to export ball mill spare parts to countries around the world, including Russia, the United States, India, and many others.
Our commitment to producing top-quality components has allowed us to establish a global presence, and we take great pride in delivering reliable, precision-engineered spare parts to our international partners.
Whether it’s supporting industries in Russia, serving the needs of businesses in the United States, or contributing to the growth of India’s industrial sector, AGICO’s ball mill spare parts are trusted and sought after worldwide.
Our dedication to excellence and our ability to meet the demands of diverse markets continue to drive our success on the global stage.


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